headless: Make HeadlessBrowser::Options move-only

headless/public/headless_browser.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/common/user_agent.h"
 #include "headless/public/headless_browser.h"
 #include "net/url_request/url_request_context_getter.h"
 
 using Options = headless::HeadlessBrowser::Options;
 using Builder = headless::HeadlessBrowser::Options::Builder;
 
 namespace headless {
 
 // Product name for building the default user agent string.
 namespace {
 const char kProductName[] = "HeadlessChrome";
 }
 
 Options::Options(int argc, const char** argv)
     : argc(argc),
       argv(argv),
       user_agent(content::BuildUserAgentFromProduct(kProductName)),
       message_pump(nullptr),
       single_process_mode(false) {}
 
-Options::Options(const Options& other) = default;
+Options::Options(Options&& options) = default;
 
 Options::~Options() {}
 
+Options& Options::operator=(Options&& options) = default;
+
 Builder::Builder(int argc, const char** argv) : options_(argc, argv) {}
 
 Builder::Builder() : options_(0, nullptr) {}
 
 Builder::~Builder() {}
 
 Builder& Builder::SetUserAgent(const std::string& user_agent) {
   options_.user_agent = user_agent;
   return *this;
 }
@@ skipping 17 matching lines @@
   options_.host_resolver_rules = host_resolver_rules;
   return *this;
 }
 
 Builder& Builder::SetSingleProcessMode(bool single_process_mode) {
   options_.single_process_mode = single_process_mode;
   return *this;
 }
 
 Options Builder::Build() {
-  return options_;
+  return std::move(options_);
 }
 
 }  // namespace headless